Seat arm



FIG. 1 is a left front perspective view of a seat arm showing my new design;

FIG. 2 is a left front perspective view shown in a representative position;

FIG. 3 is a left rear perspective view thereof;

FIG. 4 is a side elevational view of a left seat arm;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a top view thereof.

The views of the seat arm not shown form no part of the claimed design. The dashed lines represent environmental elements only and form no part of the claimed design. The separations and brackets indicate that the precise length of the seat for use thereon is not claimed. 

The ornamental design for a seat arm, as shown and described. 